mp_machdep.c revision 210939
1/*- 2 * Copyright (c) 2008 Marcel Moolenaar 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/powerpc/powerpc/mp_machdep.c 210939 2010-08-06 15:36:59Z jhb $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/ktr.h> 34#include <sys/bus.h> 35#include <sys/pcpu.h> 36#include <sys/proc.h> 37#include <sys/sched.h> 38#include <sys/smp.h> 39 40#include <vm/vm.h> 41#include <vm/vm_param.h> 42#include <vm/pmap.h> 43#include <vm/vm_map.h> 44#include <vm/vm_extern.h> 45#include <vm/vm_kern.h> 46 47#include <machine/bus.h> 48#include <machine/cpu.h> 49#include <machine/intr_machdep.h> 50#include <machine/platform.h> 51#include <machine/md_var.h> 52#include <machine/smp.h> 53 54#include "pic_if.h" 55 56extern struct pcpu __pcpu[MAXCPU]; 57 58volatile static int ap_awake; 59volatile static u_int ap_letgo; 60volatile static uint32_t ap_decr; 61volatile static u_quad_t ap_timebase; 62static u_int ipi_msg_cnt[32]; 63 64void 65machdep_ap_bootstrap(void) 66{ 67 /* Set up important bits on the CPU (HID registers, etc.) */ 68 cpudep_ap_setup(); 69 70 /* Set PIR */ 71 PCPU_SET(pir, mfspr(SPR_PIR)); 72 PCPU_SET(awake, 1); 73 __asm __volatile("msync; isync"); 74 75 while (ap_letgo == 0) 76 ; 77 78 /* Initialize DEC and TB, sync with the BSP values */ 79 decr_ap_init(); 80 mttb(ap_timebase); 81 __asm __volatile("mtdec %0" :: "r"(ap_decr)); 82 83 atomic_add_int(&ap_awake, 1); 84 printf("SMP: AP CPU #%d launched\n", PCPU_GET(cpuid)); 85 86 /* Initialize curthread */ 87 PCPU_SET(curthread, PCPU_GET(idlethread)); 88 PCPU_SET(curpcb, curthread->td_pcb); 89 90 /* Let the DEC and external interrupts go */ 91 mtmsr(mfmsr() | PSL_EE); 92 93 /* Announce ourselves awake, and enter the scheduler */ 94 sched_throw(NULL); 95} 96 97struct cpu_group * 98cpu_topo(void) 99{ 100 101 return (smp_topo_none()); 102} 103 104void 105cpu_mp_setmaxid(void) 106{ 107 struct cpuref cpuref; 108 int error; 109 110 mp_ncpus = 0; 111 error = platform_smp_first_cpu(&cpuref); 112 while (!error) { 113 mp_ncpus++; 114 error = platform_smp_next_cpu(&cpuref); 115 } 116 /* Sanity. */ 117 if (mp_ncpus == 0) 118 mp_ncpus = 1; 119 120 /* 121 * Set the largest cpuid we're going to use. This is necessary 122 * for VM initialization. 123 */ 124 mp_maxid = min(mp_ncpus, MAXCPU) - 1; 125} 126 127int 128cpu_mp_probe(void) 129{ 130 131 /* 132 * We're not going to enable SMP if there's only 1 processor. 133 */ 134 return (mp_ncpus > 1); 135} 136 137void 138cpu_mp_start(void) 139{ 140 struct cpuref bsp, cpu; 141 struct pcpu *pc; 142 int error; 143 144 error = platform_smp_get_bsp(&bsp); 145 KASSERT(error == 0, ("Don't know BSP")); 146 KASSERT(bsp.cr_cpuid == 0, ("%s: cpuid != 0", __func__)); 147 148 error = platform_smp_first_cpu(&cpu); 149 while (!error) { 150 if (cpu.cr_cpuid >= MAXCPU) { 151 printf("SMP: cpu%d: skipped -- ID out of range\n", 152 cpu.cr_cpuid); 153 goto next; 154 } 155 if (all_cpus & (1 << cpu.cr_cpuid)) { 156 printf("SMP: cpu%d: skipped - duplicate ID\n", 157 cpu.cr_cpuid); 158 goto next; 159 } 160 if (cpu.cr_cpuid != bsp.cr_cpuid) { 161 void *dpcpu; 162 163 pc = &__pcpu[cpu.cr_cpuid]; 164 dpcpu = (void *)kmem_alloc(kernel_map, DPCPU_SIZE); 165 pcpu_init(pc, cpu.cr_cpuid, sizeof(*pc)); 166 dpcpu_init(dpcpu, cpu.cr_cpuid); 167 } else { 168 pc = pcpup; 169 pc->pc_cpuid = bsp.cr_cpuid; 170 pc->pc_bsp = 1; 171 } 172 pc->pc_cpumask = 1 << pc->pc_cpuid; 173 pc->pc_hwref = cpu.cr_hwref; 174 all_cpus |= pc->pc_cpumask; 175next: 176 error = platform_smp_next_cpu(&cpu); 177 } 178} 179 180void 181cpu_mp_announce(void) 182{ 183 struct pcpu *pc; 184 int i; 185 186 for (i = 0; i <= mp_maxid; i++) { 187 pc = pcpu_find(i); 188 if (pc == NULL) 189 continue; 190 printf("cpu%d: dev=%x", i, (int)pc->pc_hwref); 191 if (pc->pc_bsp) 192 printf(" (BSP)"); 193 printf("\n"); 194 } 195} 196 197static void 198cpu_mp_unleash(void *dummy) 199{ 200 struct pcpu *pc; 201 int cpus, timeout; 202 203 if (mp_ncpus <= 1) 204 return; 205 206 cpus = 0; 207 smp_cpus = 0; 208 SLIST_FOREACH(pc, &cpuhead, pc_allcpu) { 209 cpus++; 210 pc->pc_other_cpus = all_cpus & ~pc->pc_cpumask; 211 if (!pc->pc_bsp) { 212 if (bootverbose) 213 printf("Waking up CPU %d (dev=%x)\n", 214 pc->pc_cpuid, (int)pc->pc_hwref); 215 216 platform_smp_start_cpu(pc); 217 218 timeout = 2000; /* wait 2sec for the AP */ 219 while (!pc->pc_awake && --timeout > 0) 220 DELAY(1000); 221 222 } else { 223 PCPU_SET(pir, mfspr(SPR_PIR)); 224 pc->pc_awake = 1; 225 } 226 if (pc->pc_awake) { 227 if (bootverbose) 228 printf("Adding CPU %d, pir=%x, awake=%x\n", 229 pc->pc_cpuid, pc->pc_pir, pc->pc_awake); 230 smp_cpus++; 231 } else 232 stopped_cpus |= (1 << pc->pc_cpuid); 233 } 234 235 ap_awake = 1; 236 237 /* Provide our current DEC and TB values for APs */ 238 __asm __volatile("mfdec %0" : "=r"(ap_decr)); 239 ap_timebase = mftb() + 10; 240 __asm __volatile("msync; isync"); 241 242 /* Let APs continue */ 243 atomic_store_rel_int(&ap_letgo, 1); 244 245 mttb(ap_timebase); 246 247 while (ap_awake < smp_cpus) 248 ; 249 250 if (smp_cpus != cpus || cpus != mp_ncpus) { 251 printf("SMP: %d CPUs found; %d CPUs usable; %d CPUs woken\n", 252 mp_ncpus, cpus, smp_cpus); 253 } 254 255 /* Let the APs get into the scheduler */ 256 DELAY(10000); 257 258 smp_active = 1; 259 smp_started = 1; 260} 261 262SYSINIT(start_aps, SI_SUB_SMP, SI_ORDER_FIRST, cpu_mp_unleash, NULL); 263 264int 265powerpc_ipi_handler(void *arg) 266{ 267 cpumask_t self; 268 uint32_t ipimask; 269 int msg; 270 271 CTR2(KTR_SMP, "%s: MSR 0x%08x", __func__, mfmsr()); 272 273 ipimask = atomic_readandclear_32(&(pcpup->pc_ipimask)); 274 if (ipimask == 0) 275 return (FILTER_STRAY); 276 while ((msg = ffs(ipimask) - 1) != -1) { 277 ipimask &= ~(1u << msg); 278 ipi_msg_cnt[msg]++; 279 switch (msg) { 280 case IPI_AST: 281 CTR1(KTR_SMP, "%s: IPI_AST", __func__); 282 break; 283 case IPI_PREEMPT: 284 CTR1(KTR_SMP, "%s: IPI_PREEMPT", __func__); 285 sched_preempt(curthread); 286 break; 287 case IPI_RENDEZVOUS: 288 CTR1(KTR_SMP, "%s: IPI_RENDEZVOUS", __func__); 289 smp_rendezvous_action(); 290 break; 291 case IPI_STOP: 292 293 /* 294 * IPI_STOP_HARD is mapped to IPI_STOP so it is not 295 * necessary to add such case in the switch. 296 */ 297 CTR1(KTR_SMP, "%s: IPI_STOP or IPI_STOP_HARD (stop)", 298 __func__); 299 self = PCPU_GET(cpumask); 300 savectx(PCPU_GET(curpcb)); 301 atomic_set_int(&stopped_cpus, self); 302 while ((started_cpus & self) == 0) 303 cpu_spinwait(); 304 atomic_clear_int(&started_cpus, self); 305 atomic_clear_int(&stopped_cpus, self); 306 CTR1(KTR_SMP, "%s: IPI_STOP (restart)", __func__); 307 break; 308 } 309 } 310 311 return (FILTER_HANDLED); 312} 313 314static void 315ipi_send(struct pcpu *pc, int ipi) 316{ 317 318 CTR4(KTR_SMP, "%s: pc=%p, targetcpu=%d, IPI=%d", __func__, 319 pc, pc->pc_cpuid, ipi); 320 321 atomic_set_32(&pc->pc_ipimask, (1 << ipi)); 322 PIC_IPI(root_pic, pc->pc_cpuid); 323 324 CTR1(KTR_SMP, "%s: sent", __func__); 325} 326 327/* Send an IPI to a set of cpus. */ 328void 329ipi_selected(cpumask_t cpus, int ipi) 330{ 331 struct pcpu *pc; 332 333 SLIST_FOREACH(pc, &cpuhead, pc_allcpu) { 334 if (cpus & pc->pc_cpumask) 335 ipi_send(pc, ipi); 336 } 337} 338 339/* Send an IPI to a specific CPU. */ 340void 341ipi_cpu(int cpu, u_int ipi) 342{ 343 344 ipi_send(cpuid_to_pcpu[cpu], ipi); 345} 346 347/* Send an IPI to all CPUs EXCEPT myself. */ 348void 349ipi_all_but_self(int ipi) 350{ 351 struct pcpu *pc; 352 353 SLIST_FOREACH(pc, &cpuhead, pc_allcpu) { 354 if (pc != pcpup) 355 ipi_send(pc, ipi); 356 } 357} 358